UNIX Sixth Edition
From Computer History Wiki
This was one of the more popular research versions to leave Bell Labs.
Platforms
These are the known platforms to run Unix v6
PDP-11
the PDP-11 was the primary platform which Unix v6 was written on. All other v6's can trace themselves back to this version.
Interdata 32b
The Interdata 32b was the first port to a 32 bit platform outside of Bell Labs.
Folk Lore
v6 Unix is perhaps famous because of the "Lions book". John Lions ( bio: http://en.wikipedia.org/wiki/John_Lions ) wrote up an excellent disection of the unix kernel, and taught it in his OS classes. The book became *the* guide to the unix internals, and was photocopied over & over...